Rudolf von feommee



I Jan. 27, 1931. VONIF'ROMMER 1,790612- BREECH" BOLT MECHANISM FORSPORTING GUNS Filed Oct. 16, 1929 INVENTOR film/elf van fl'omrnrATTORNEYS "20 invention isshown by way of example.

parts,

' end 4 of the shaft 3 is snu 1y fittin UE STA E;

:aUnoLr voN FROMMER; orBU DArnsnn'UNeAnY BREEGH-IBOLT MECHANISM 'FORSPORTING GUNS;

, Application filed October 16, 192a,- Serial no,

7 This invention relates to a breech bolt. mechanism for sporting guns.The invention is characterized by the arrangement of a sleeve ontheshaft of the locking bolt actuat- 5 ing key the said sleeve being actedupon by the locking spring whichis preferably made in the form of aspiral spring. The said key shaft and sleeve are of such constructionthat their coupling may'not be effected otherwise 1 than by mountingthem into the breechbody. For facilitating the assembling and the dismounting of the parts the said spiral spring acting upon thesaidsleeveon' the key shaft is so arranged that while one end thereof isact ing upon the sleeve the other end is supported by a spring casingwhich may be easily in-' serted into and extractedfroni the gun. i Inthe accompanying drawing one formof l the breech bolt mechanismaccording to the Fig. lshows the key, made of two assembled in thebreechbody. I

Figs. 2 and 3 show the two portions'of the key shaft, each for itself. Ii I v 7 Figs. 4 and 5 are different elevations of the key.

Fin". 6 shows the keymounted in the breech body together with itsactuating spring and the casing of the latter, in a horizontal seci 130tional view.

The key 1 is'provided'with the conventional square hole-2 (Fig. 4-) intowhich the squared The two parts .are interconnected by means of thescrew 5Q On the shaft/3; there is arranged a h1g6 which actuates thelocking bolt 7 in a known manner. The upper bolt 8 is opera ated by'thenotch'9of thekey 1, in which 7 engages the lug 10, of the'said bolt 8:(Figs. 1. and Mounted onthe shaft 3 there is a sleeve 11,the nose1'2 ofwhich fits into the notch 14 of the key 1, whereby a connectionbetweenthe sleeve and the key is established. The'spiral springjlfiis'mounted in a case V 25 which is held in'the cavities 23' and 24 of thebreech body 21 by the projections 19 and 20. -For assembling the springcasing 25 in i by again locking the bolts."

"the said shoulder to move the locking bolts nature. ,7 1

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the cavities 23 andEZ l. v'l"he"projections'19 and 20 are insertedinto'these grooves and are then turned into: the cavities 23, 2 1. *Ofcourse, a loose connection between the spring casing 25 and the breechbody 21 maybe established inlany other way. I

The spring 16 actsupon the shoulder 18 of the sleeve 11 through'theintermediationof the pressure piece 17 andtends to rotate the same inthe-direction of'the arrow shown in Fig. 6. Since the sleeve 11 iscoupled to the key 1 and the latter is connected to the shaft 3, thespring 16 will swing the keyl as well as the "shaft 3 in the samedirection. By the swinging of the key 1 towardsthe right, the two bolts7' and 8 are withdrawn in a well known manner, the spring lfibeing atthesame time tensioned. 'Upon releasing the key 1 the spring will swing thesame back there- The assembling of the breech bolt mechanism' describedis effected in the following 7 manner I 1 c The bolt 7 is firstintroducedinto the breech body, hereupon the sleeve 11 is pushed into.the breech body downwards from thetop and then the shaft 3 is introducedupwards from the bottoin The upper bolt 8' is now 'inserted, the key 1mounted and screwed to the shaft 3 by theiscrew 5. q i

7 Having described my invention I claim In a breech bolt mechanism'forsporting;

' guns, lockingbolts, a key for operatingfthe saldlocking bolts and havng a'shaft, asle'eve on the, said shaft coupled to the said key and 1having ashouldena spring casing connected the breech body, o k ng,bolt'actilating spiral spring containedin thesaid springv cas ng, thesaid actuatlng. spring acting upon into their lockingpositiom i olntestimony whereof have afiiXed-m y sig:

RUDOLF VQN' FRoMMnn, 1

the breech body there are arranged in the lat rooves 27'and 28 (Fig.

ter two introducing a i 59 1) which are positioned at 9Q with respect to

